The Infrared Radiation (IR) on the surface of a rock being loaded will change significantly during its failure process. To effectively monitor and predict rock failure by the IR method, in this paper, the Infrared Radiation Variation Temperature Field (IRVTF) of rock under uniaxial compression was identified. It was found that some IRVTF thermal images were characterized by obvious temperature rise in the later stage of rock loading. The temperature distribution characteristics of IRVTF were analyzed. It was observed that the temperature of the IRVTF exhibited the logarithmic linear distribution within the selected statistical temperature range, with an average coefficient of correlation greater than 0.96. On this basis, the index of “Infrared Radiation b-value (b_IR-value)” of rock under uniaxial compression was defined for the first time, and the threshold for identifying its sudden change was proposed. It was found that the sudden changes of b_IR-value could be observed with the generation of large-scale micro-cracks. The average amplitude of the b_IR-value at first sudden change for all samples was 16.58 times of the mean amplitude before the sudden change on average, which indicated the significance of the b_IR-value sudden change. The first sudden change of the b_IR-value was 22.5 s ahead of the peak stress on average, which could be used as a precursor of rock failure and instability. The findings of the research can help with the monitoring and early warning of surrounding rock instability in mines, tunnels, and other geotechnical projects.

在岩石加载过程中，被加载岩石表面的红外辐射（IR）将发生显着变化。为了通过红外方法有效监测和预测岩石破坏，本文确定了岩石在单轴压缩下的红外辐射变化温度场（IRVTF）。发现在岩石加载的后期，某些IRTVF热图像的特征是温度明显升高。分析了IRFTF的温度分布特征。观察到，IRVTF的温度在选定的统计温度范围内呈现对数线性分布，平均相关系数大于0.96。在此基础上，“红外辐射b值（b _IR首次定义了岩石在单轴压缩下的“-值”，并提出了识别其突然变化的阈值。发现随着大量微裂纹的产生，可以观察到b _IR值的突然变化。所有样品在第一次突然变化时的b _IR值的平均幅度是平均突然变化之前的平均幅度的16.58倍，这表明了b _IR值突然变化的重要性。b _IR的第一次突然变化-值平均比峰值应力高22.5 s，可以用作岩石破坏和失稳的先兆。研究的结果可以帮助监测和预警矿山，隧道和其他岩土工程中的围岩不稳定性。